Grinding and polishing apparatus



July 31, 1928. 1,678,732

P. J. KNAUS GRINDING AND POLISHING APPARATUS Filed March 13, 192.5

Pefen/ Aflaus ymv - an an, 1928.,

STATES I 1,678,732 PATE T m ries.

PETE R an: AWS, OF CHICAGO, ILLINOIS, -A SSIGNOB TO WESTERN ELECTRIC COH- INGOBPOBA'IED, OF NEW YORK, N. 2., A'CORPORA'IION OF NEW YORK.

ems AND romsnme arrana'riis.

Application and Hatch 1a, 1925. Serial no. inane.

.This invention relates to a grinding. and .polishing apparatus, and more part cularly to an improved apparatus for grmdmg and polishing cylindrically shaped articles.

a The present invention is applicable to that class of grinding machines commonly known as centerless 'grinders? and particularly'to that type of centerless grinders wherein the grinding and feeding wheels are periphen' tures of the invention will be particularlypointed out in the appended claims.

In the preferred form of the invention the contacting surfaces of both .the feeding and grinding wheelsgrre 'rofiled or beveled on the forward edges their peripheries so that as the article to be ground is passed therebetween it may be abraded to a greater depth and in graduated steps, as illustrated in the accompanying drawings. The rear portions of the wheels may be composed of a relatively fin'er grade of abrading material and .their contacting surfaces are substantially parallelto each other, thereby producing a polishing action which is of considerable value. In a-modified form of this invention the grinding and feeding wheels are not profiled, but the same general result is obtained by inclinin the work sup ort rela- U tive. to the axis of t e grinding w eel.

In the accompanying drawing, Fig. 1 is a front elevation, part1 1n section,-of a centerless grinding mac ine em-. bodying the features of the present inven tion, and

- Fig. 2 is a fragmentarydetail view of the feeding and grinding wheels.

Referring now to the drawingsin detail wherein like reference characters designate corresponding parts throughout the several views. 10 denotes a main frame of hollow or box like construction, near the upper porac tion of which is formed a bed or table 11 and a well' or cavity .12, which receives water supplied to the work from a nozzle 17 connected to any suitable supply source not shown). Rotatably purnaled in suitable bearings supported by the frame 10 is a, horithroughout the length thereof progressively zontal shaft 13 to which is secured a pair of annular disk members 14 and 15. Fastened between the disk members 14 and 15 by means of a nut 29 is an annular grinding wheel 16 which may be composedof any to suitable abrading material. O

Cooperating with and peripherally op posed to the grinding wheel 16 is a feeding and governing wheel 18 which is likewisevof annular'form and may be composed of any suitable material that is readily dressed. The feeding wheel 18 is clamped between a pair of annular disk members 19 and 20, carried by a spindle or arbor 21. The clamping disks 19 and 20 are firmly pressed into and held in binding engagement with the feeding wheel 18 by a nut 30 threaded upon the s indle 21. The function of the feeding an Y governing wheel is, as its name would suggest, to govern or control the ro- .7

;tation of the work, to support it properly in contact with the periphery of the grinding wheel, and to effect the axial traverse or feeding of the work by acting upon the wellknown principle of a skew-roll.-

{is shown in Fig. 1, the centers of the grinding and feeding wheels are preferably in the same horizontal plane. When it is desired to effect an automatic axial feed or traverse of the article being ground, the feeding wheel 18 is ti ped on its central oint at a predetermine angle to the grindmg wheelfi 16 as best shown in Fig. 2, thereby causing, an oblique relation of the axis of the feeding wheel relatively to the axis of the work. 7 This causes the'work to ad- Vance 'with a spiral or screw-like motion across the face of the grinding wheel, thus presenting the entire surface of the work face,

the relation between the grinding and feeding to the gri'ndin In the drawln diameters of ti wheels is shown as approximately three to two, but neitherthis norany other specific 1 f relation is essential to the successful opera.- tion of the machine. Both the feeding and the grinding wheels are rotated in a clockwise direction when viewed from the front of the machine, the larger or'grinding wheel moving downwardly and the smaller. or feeding wheel moving upwardly where they contact with the work. Suitable gearing is pro- I vided whereby the rotation of the governing and feeding wheel is made relatively slow and that of the grinding wheel is made relatively fast. In practice, the speeds and the ratio of speeds of the wheels 16 and 18 may vary within reasonable limits depending somewhat upon the nature of the article being ground and the amount of material which it is desired to remove in a given time or within a given traverse of the work.

Positioned immediately in front of and midway between the grinding wheel 16 and the feeding wheel 18 is a horizontally disposed work support 25 of well known construction which serves as a rest for the article being ground as it advances through the machine.

Any suitable mechanisms may be provided for adjusting the feeding wheel 18,

towards and away from the grinding wheel 16 to accommodate work of different diameters and also for tipping the feeding wheel 18 at any desired angle to cause a traverse of the work atany predetermined speed. The mechanisms for performing these operations, which have been shown more or less schematic'all in the accompanying drawing, are wel known in the art andthrough the machine. This is an important improvement in the art of centerless grinding, particularly for grinding articles of a relatively soft material, such as rubber, fibre, carbon, etc.,' since it decreases the number of times that a given articlem'ust be passed through a machine to remove a predetermined amount ofrmaterial. However, it is obvious that the inyention is not limited to grinding articles of such material and is only limited by the scope of the appended claims.

. The rear portions of the wheels '16 and 18' may be composed of a relatively finer grade of abrading material and their contacting surfaces are substantially parallel to each other as indicated at 22 and 23, thereby providing a polishing action for the ground article as it emerges from the machine. I

What is claimed is: I 1. In a grinding machine, a grinding wheel and a feeding wheel peripherally op posed to the periphery of said grinding wheel, said grinding and feeding wheels having the forward edges of their peripheries profiled and the rear edges of their peripheries parallel to each other. v

2. In a rinding machine, a grinding wheel, a fee ing wheel peripherally opposed to the periphery of said grinding wheel, means for rotating said'grinding and feeding wheels, and means for supporting and guiding an article to be ground between the peripheries of said wheels, the forward portions of said wheels being profiled to abrade' said article at graded depths, and the rear portions of said wheels being parallel to each other to therebet-ween.

'In witness whereof, I hereunto'subscribed my name this 3rd day of March A. D., 1925. PETER JOHN KNAUS.

polish said article as-it passes I 

